Add support for MOI.ScalarNonLinearFunction

[frapac]

Address #279

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 71.56550% with 89 lines in your changes missing coverage. Please review.

Project coverage is 72.42%. Comparing base (f0effa2) to head (42a6369).
Report is 57 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Interfaces/MOI_interface.jl	54.60%	69 Missing ⚠️
src/Interfaces/utils.jl	87.57%	20 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #280      +/-   ##
==========================================
- Coverage   75.36%   72.42%   -2.94%     
==========================================
  Files          40       41       +1     
  Lines        4120     4762     +642     
==========================================
+ Hits         3105     3449     +344     
- Misses       1015     1313     +298     

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[sshin23]

Thanks, @frapac!